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A kind of reactor and the method for preparing pseudo-boehmite

A reactor and reaction technology, applied in the field of reactors, can solve problems such as complex preparation process, fluctuation of product properties, dispersion of alumina pore size distribution, etc., and achieve the effect of simple process, easy operation, and concentrated grain distribution

Active Publication Date: 2021-11-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The pore diameter and pore volume of activated alumina obtained by CN1057443A, CN1254684A, CN1420082A are small, and the pore structure also changes with the change of operating conditions and external environment, so that its application is subject to certain restrictions, and its reaction process is also based on batch operation , resulting in low device utilization, fluctuations in product properties and other shortcomings
Although this method realizes the continuous preparation of pseudo-boehmite by the carbonization method, the preparation process is more complicated, and the aluminum-containing alkaline solution or the generated slurry is deflected and back-mixed in the micro-unit carbonization reactor, which is easy to cause The residence time of the carbonization reactor is inconsistent, so that the grain size of the pseudo-boehmite produced is different, and the pore size distribution of the calcined alumina is dispersed.

Method used

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  • A kind of reactor and the method for preparing pseudo-boehmite
  • A kind of reactor and the method for preparing pseudo-boehmite
  • A kind of reactor and the method for preparing pseudo-boehmite

Examples

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Embodiment 1

[0053] This example uses as figure 2 and 3 The three cylinders shown form a sleeve reactor. Take industrial-grade aluminum hydroxide powder and industrial-grade sodium hydroxide to configure a concentration of 370 gAl 2 o 3 / L of concentrated sodium metaaluminate solution, and then dilute the concentrated sodium metaaluminate with 3% NaOH solution to obtain a concentration of 25gAl 2 o 3 / L, sodium metaaluminate solution with a caustic ratio of 1.35, the sodium metaaluminate solution is continuously injected into the first raw material inlet 10 of the sleeve reactor, and at the same time, the second raw material inlet 11 of the third cylinder of the sleeve reactor -3 enter CO 2 Mixed gas with air, CO controlled 2 The volume concentration of the sodium metaaluminate solution is 15%. The sodium metaaluminate solution reacts with the mixed gas discharged from the discharge hole 8 of the conduit 7 of each layer during the upward movement of the third cylinder. When the slur...

Embodiment 2

[0055] Other is the same as embodiment 1, just air and CO 2 CO in the mixed gas 2 The volume concentration of the aluminum oxide a-2 was changed to 25%, and the physical and chemical properties of the obtained alumina a-2 are shown in Table 1.

Embodiment 3

[0057] Other is the same as embodiment 1, just changes the sodium metaaluminate concentration into 35gAl 2 o 3 / L, to obtain pseudo-boehmite A-3 of the present invention, the physical and chemical properties of gained alumina a-3 are shown in Table 1, and the particle diameter distribution of pseudo-boehmite A-3 is shown in Table 1. figure 1 .

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Abstract

The invention discloses a reactor and a method for preparing pseudo-boehmite. The reactor consists of N cylinders nested together to form a sleeve-type reactor. The cylinder has a hollow sandwich structure. The sleeve-type reactor is sequentially composed of the first cylinder, the second cylinder, ..., The Nth cylinder; the Nth cylinder is provided with a first raw material inlet, the first cylinder is provided with a discharge port, the 2nd-Nth cylinder is respectively provided with an overflow port and an overflow conduit, and the 1st-Nth cylinder is provided with an overflow port and an overflow conduit. A second raw material inlet is provided respectively; conduits are provided in the Nth cylinder and between two adjacent cylinders, and discharge holes are provided on the conduits. The grain distribution of the pseudo-boehmite prepared by the reactor is concentrated, and the pore structure of the alumina obtained by roasting meets the requirements of the residue hydrogenation catalyst carrier, and the overall process is simple and easy to operate.

Description

technical field [0001] The invention relates to a reactor, in particular to a reactor for preparing pseudo-boehmite and a method for preparing pseudo-boehmite by using the reactor. Background technique [0002] There are many types of alumina such as γ-Al 2 o 3 , η-Al 2 o 3 , θ-Al 2 o 3 、δ-Al 2 o 3 and α-Al 2 o 3 etc., where γ-Al 2 o 3 Due to its large specific surface area, adjustable pore structure and good thermal stability, it has a very wide range of applications in the field of catalysis, especially in the field of catalytic hydrogenation. Preparation of γ-Al 2 o 3 The usual method is to prepare pseudo-boehmite first, and then roast it at a certain temperature to convert it into γ-Al 2 o 3 . Pseudo-boehmite generally has three preparation methods in industry: [0003] (1) Neutralization reaction of aluminum salt and alkali, such as aluminum chloride method: [0004] AlCl 3 +3NH 4 OH→Al(OH) 3 +3NH 4 Cl; [0005] (2) Metathesis reaction of aluminum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/24C01F7/14
CPCB01J19/244C01F7/14
Inventor 王永林关月明张成杨刚
Owner CHINA PETROLEUM & CHEM CORP